Reacción #1350592

Ecuación de reacción

NaNO2

methyl 2-amino-4-methylbenzothiazole-5-carboxylate

KOH

HCl

→

4-Methylbenzothiadiazole-5-carboxylic Acid

Condiciones de reacción

Tratamiento posterior

1. 1
   Otroat 0-10° C
2. 2
   Extracciónextracted with ethyl acetate
3. 3
   LavadoThe extract was washed
4. 4
   Otrodried
5. 5
   Otrothe product was obtained

Procedimiento

5 g of methyl 2-amino-4-methylbenzothiazole-5-carboxylate (0.02 mol) in 28.6 g of 50% strength KOH were stirred at 120° C. for 4 h. The mixture was then neutralized with 10% strength HCl and admixed with an excess of 40% strength NaNO2 solution at 0-10° C. The reaction mixture was acidified and extracted with ethyl acetate. The extract was washed and dried, and the product was obtained by stripping off the solvent. Yield: 1.3 g (28%).

Fuente